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  1. #include <iostream>
  2. #include <deque>
  3.  
  4. using namespace std;
  5.  
  6. template <class T>
  7. struct Operation
  8. {
  9.     virtual ~Operation() {}
  10.  
  11.     virtual Operation * Clone() const = 0;
  12.  
  13.     virtual T ApplyDirect (T value) const = 0;
  14.     virtual T ApplyInverse(T value) const = 0;
  15. };
  16.  
  17. template <class T>
  18. struct Add : Operation<T>
  19. {
  20.     T amount;
  21.  
  22.     Add(T amount_) : amount(amount_) {}
  23.  
  24.     Add * Clone() const { return new Add(amount); }
  25.  
  26.     T ApplyDirect (T value) const { return value + amount; }
  27.     T ApplyInverse(T value) const { return value - amount; }
  28. };
  29.  
  30. template <class T>
  31. struct Mul : Operation<T>
  32. {
  33.     T amount;
  34.  
  35.     Mul(T amount_) : amount(amount_) {}
  36.  
  37.     Mul * Clone() const { return new Mul(amount); }
  38.  
  39.     T ApplyDirect (T value) const { return value * amount; }
  40.     T ApplyInverse(T value) const { return value / amount; }
  41. };
  42.  
  43. template <class T, unsigned N>
  44. class MassiveValArray
  45. {
  46.     deque<T> data;
  47.  
  48.     deque<unsigned> changedElements;
  49.     deque<Operation<T>*> operations;
  50.  
  51.     void makeSomeCalculations()
  52.     {
  53.         if (changedElements.empty()) return;
  54.  
  55.         static const unsigned elementsChangedPerCall = 3;
  56.  
  57.         for (unsigned i = 0; i < elementsChangedPerCall; ++ i)
  58.         {
  59.             unsigned index = changedElements[0] + i;
  60.  
  61.             if (index >= N) break;
  62.  
  63.             data[index] = operations[0]->ApplyDirect(data[index]);
  64.         }
  65.  
  66.         changedElements[0] += elementsChangedPerCall;
  67.  
  68.         if (changedElements[0] >= N)
  69.         {
  70.             changedElements.pop_front();
  71.  
  72.             delete operations[0];
  73.             operations.pop_front();
  74.         }
  75.     }
  76.  
  77. public:
  78.  
  79.     MassiveValArray() : data(N) {}
  80.     MassiveValArray(T initialValue) : data(N, initialValue) {}
  81.  
  82.     ~MassiveValArray() { for (unsigned i = 0; i < operations.size(); ++ i) delete operations[i]; }
  83.  
  84.     T Get(unsigned index)
  85.     {
  86.         if (operations.empty()) return data[index];
  87.  
  88.         makeSomeCalculations();
  89.  
  90.         T ret = data[index];
  91.  
  92.         for (unsigned i = 0, size = operations.size(); i < size; ++ i)
  93.             if (changedElements[i] <= index)
  94.                 ret = operations[i]->ApplyDirect(ret);
  95.  
  96.         return ret;
  97.     }
  98.  
  99.     void Set(unsigned index, T value)
  100.     {
  101.         if (operations.empty()) { data[index] = value; return; }
  102.  
  103.         makeSomeCalculations();
  104.  
  105.         for (unsigned i = operations.size() - 1; i + 1 > 0; -- i)
  106.             if (changedElements[i] <= index)
  107.                 value = operations[i]->ApplyInverse(value);
  108.  
  109.         data[index] = value;
  110.     }
  111.  
  112.     void ApplyToAll(const Operation<T> & op)
  113.     {
  114.         operations.push_back(op.Clone());
  115.         changedElements.push_back(0);
  116.  
  117.         makeSomeCalculations();
  118.     }
  119.  
  120.     ostream & Print()
  121.     {
  122.         for (unsigned i = 0; i < N; ++ i)
  123.             cout << Get(i) << " ";
  124.  
  125.         return cout << endl;
  126.     }
  127.  
  128.     ostream & PrintOpInfo() const
  129.     {
  130.         unsigned opCount = operations.size();
  131.  
  132.         cout << "stacked ops : " << opCount << endl;
  133.  
  134.         if (opCount > 0)
  135.             cout << "front op completion : "
  136.                  << changedElements[0] * 100 / N
  137.                  << "%" << endl;
  138.  
  139.         return cout;
  140.     }
  141. };
  142.  
  143. int main()
  144. {
  145.     MassiveValArray<double, 35> arr(1);
  146.  
  147.     arr.Print();
  148.  
  149.     arr.ApplyToAll(Mul<double>(2.0)); arr.ApplyToAll(Add<double>(1.0));
  150.     arr.ApplyToAll(Mul<double>(2.0)); arr.ApplyToAll(Add<double>(3.0));
  151.  
  152.     arr.Set(0, 0.0); arr.Set(1, 1.0); arr.Set(2, 2.0); arr.Set(3, 3.0); arr.Set(4, 4.0); arr.Set(5, 5.0);
  153.  
  154.     cout << "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n" << endl;
  155.  
  156.     arr.PrintOpInfo();
  157.  
  158.     cout << "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n" << endl;
  159.  
  160.     arr.Print() << endl; arr.PrintOpInfo();
  161.  
  162.     cout << "\n=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n" << endl;
  163.  
  164.     arr.Print() << endl; arr.PrintOpInfo();
  165. }
Success #stdin #stdout 0.01s 2828KB
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stdin
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Standard input is empty
stdout
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1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

stacked ops : 4
front op completion : 85%

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

0 1 2 3 4 5 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 

stacked ops : 1
front op completion : 77%

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

0 1 2 3 4 5 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 9 

stacked ops : 0
https://ideone.com/z1Hi7
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
secret

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